Article

Timed inhibition of p38MAPK directs accelerated differentiation of human embryonic stem cells into cardiomyocytes

Department of Medicine, University of California, San Francisco, California, USA.
Cytotherapy (Impact Factor: 3.29). 10/2010; 12(6):807-17. DOI: 10.3109/14653249.2010.491821
Source: PubMed

ABSTRACT

Heart failure therapy with human embryonic stem cell (hESC)-derived cardiomyocytes (hCM) has been limited by the low rate of spontaneous hCM differentiation. As others have shown that p38 mitogen-activated protein kinase (p38MAPK) directs neurogenesis from mouse embryonic stem cells, we investigated whether the p38MAPK inhibitor, SB203580, might influence hCM differentiation.
We treated differentiating hESC with SB203580 at specific time-points, and used flow cytometry, immunocytochemistry, quantitative real-time (RT)-polymerase chain reaction (PCR), teratoma formation and transmission electron microscopy to evaluate cardiomyocyte formation.
We observed that the addition of inhibitor resulted in 2.1-fold enrichment of spontaneously beating human embryoid bodies (hEB) at 21 days of differentiation, and that 25% of treated cells expressed cardiac-specific α-myosin heavy chain. This effect was dependent on the stage of differentiation at which the inhibitor was introduced. Immunostaining and teratoma formation assays demonstrated that the inhibitor did not affect hESC pluripotency; however, treated hESC gave rise to hCM exhibiting increased expression of sarcomeric proteins, including cardiac troponin T, myosin light chain and α-myosin heavy chain. This was consistent with significantly increased numbers of myofibrillar bundles and the appearance of nascent Z-bodies at earlier time-points in treated hCM. Treated hEB also demonstrated a normal karyotype by array comparative genomic hybridization and viability in vivo following injection into mouse myocardium.
These studies demonstrate that p38MAPK inhibition accelerates directed hCM differentiation from hESC, and that this effect is developmental stage-specific. The use of this inhibitor should improve our ability to generate hESC-derived hCM for cell-based therapy.

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    • "The success story of Wnt inhibitor mediated cardiac differentiation [7, 29] has tempted biomedical researchers to overlook other druggable targets. However, in recent years the interest toward previously poorly studied signaling pathways like MAPK has increased [30, 31]. Other druggable targets under investigation include: microRNAs [32, 33]; mTOR signaling pathway [34]; TGF-β signaling pathway [35]; Neuregulin/ErbB signaling pathway [36]; retinoid signaling [37]. "

    Full-text · Article · Mar 2015
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    • "SB203580-treated hEBs display an increase in expression of both early mesoderm markers (Brachyury T, Tbx6, and Mesp1) and cardiac αMHC as well as increased cardiomyocyte numbers. Gaur and colleagues [38] subsequently showed that p38MAPK inhibition occurs in a dose- and stage-dependent manner, that it also causes the accelerated differentiation of hESC-derived cardiomyocytes by using the standard hEB formation method, and that it appears to act at the ectoderm/mesoendoderm branch point during hESC differentiation. "
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    ABSTRACT: Human embryonic stem cells have the capacity for self-renewal and pluripotency and thus are a primary candidate for tissue engineering and regenerative therapies. These cells also provide an opportunity to study the development of human tissues ex vivo. To date, numerous human embryonic stem cell lines have been derived and characterized. In this review, we will detail the strategies used to direct tissue-specific differentiation of embryonic stem cells. We also will discuss how these strategies have produced new sources of tissue-specific progenitor cells. Finally, we will describe the next generation of methods being developed to identify and select stem cell-derived tissue precursors for experimental study and clinical use.
    Preview · Article · May 2012 · Stem Cell Research & Therapy
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    • "No data are available regarding hCSC. However, a role played by p38MAPK inhibition in inducing myocyte differentiation of embryonic stem cells has been reported(Gaur, et al., 2010). "

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